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Poster: Ryan Schweitzer Date: Aug 7, 2003 8:31pm
Forum: prelinger Subject: Re: vertical lines in converted video?

Yep, it looks like the QT codec is simply interpolating the horizontal resolution, since most of the MPEG-2 files on this site are encoded at either 360x480 or 480x480, instead of the standard 720x480 resolution (also referred to as ITU-601 or D1 resolution) that full-resolution MPEG-2 video, and DV video as well, use.

The QT codec is simply interpolating the horizontal pixels, whether it be 360 or 480 of them, to fit in a 720 horizontal pixel resolution. I'm assuming it must repeat every other pixel or something similar.

My RealMagic Hollywood+ card in my PC that I use for viewing Prelinger's (and others) MPEG-2s on my TV set does this exact same interpolating with the horiz. resolution, slightly noticeable vertical lines that look exactly the same as the example framegrab you've posted a link to.

I dunno if there's a way around this, since the codec is trying to scale the res. of the MPEG-2 files up to standard MPEG-2/DV resoultion, by way of pixel interpolation...

-Ryan


This post was modified by Ryan Schweitzer on 2003-08-08 03:31:21